B2 · بالای متوسط فصل 18

بایدها و نبایدها: چطوری مثل یک نیتیو حرف بزنیم؟

4 مجموع قواعد
20 مثال‌ها
1 دقیقه
قواعد این فصل تمرین سریع

Chapter in 30 Seconds

Master the nuances of modal verbs to express rules, requirements, and permissions with total confidence.

  • Distinguish between internal and external obligations.
  • Navigate the subtle differences between prohibition and absence of necessity.
  • Express formal and informal permissions using standard and alternative phrases.
Command the rules of English with precision.

چی یاد می‌گیری

سلام! خوش اومدی به یکی از کاربردی‌ترین بخش‌های زبان انگلیسی در سطح پیشرفته. تا حالا شده بخوای بگی «نباید این کار رو بکنی» ولی شک کنی که از mustn't استفاده کنی یا don't have to؟ یا مثلاً بخوای بگی «لازم نبود کادو بخری (ولی خریدی)»؟ توی این فصل قراره دقیقاً روی همین ظرافت‌ها کار کنیم تا سطح زبانت رو از یه زبان‌آموز معمولی به یه آدم حرفه‌ای برسونی. قراره یاد بگیری چطوری بین اجبار شخصی (must) و قوانین بیرونی (have to) فرق بذاری. فرق حیاتی بین «ممنوع بودن» و «اختیاری بودن» رو یاد می‌گیری تا توی موقعیت‌های جدی مثل محیط کار یا فرودگاه، سوءتفاهم پیش نیاد. تازه، می‌ریم سراغ ساختارهای باکلاس‌تری مثل be supposed to برای بیان انتظارات و تفاوت‌های ظریف بین needn't have و didn't need to که نشون می‌ده چقدر به زبان مسلطی. آخر این فصل، دیگه موقع اجازه گرفتن، دستور دادن یا حرف زدن از وظایف، اصلاً من‌من نمی‌کنی. می‌تونی دقیقاً همون حسی که توی ذهنته رو با کلمات درست برسونی. چه بخوای توی یه جلسه کاری از قوانین بگی، چه بخوای به دوستت بگی لازم نبود زحمت بکشه، ابزارش رو کاملاً در اختیار داری. بزن بریم!

Learning Objectives

By the end of this chapter, you will be able to:

  1. 1
    By the end you will be able to: Differentiate between internal and external obligation using must and have to.
  2. 2
    By the end you will be able to: Distinguish between prohibition and lack of necessity in professional contexts.

نکات و ترفندها (4)

💡

The 'Must' Trap

Avoid using 'must' in questions. It sounds like you are demanding an answer. Use 'Do I have to' instead.
frontend.learn_grammar.from_rule: Obligation and Necessity: Must, Have To, Need To
💡

Context is King

Always ask yourself: Is this a rule or a choice?
frontend.learn_grammar.from_rule: Prohibition vs. No Necessity: Mustn't vs. Don't Have To
💡

Use 'May' for respect

When in doubt in a professional setting, use 'may'.
frontend.learn_grammar.from_rule: Permission: Can, May, Be Allowed To, Be Supposed To
💡

The 'Needn't Have' Trap

Always use 'needn't have' for past mistakes. It shows you know the action was completed.
frontend.learn_grammar.from_rule: Needn't, Don't Need To, Didn't Need To, Needn't Have: No Obligation

واژگان کلیدی (5)

Mandatory Required by rule or law Optional Not required Forbidden Not allowed Authority Power to enforce rules Discretion Freedom to decide

Real-World Preview

briefcase

Office Protocol

Review Summary

  • Must/Have to + base verb
  • Mustn't + base verb
  • Be allowed to/May
  • Needn't/Don't need to

اشتباهات رایج

Must is not used in the negative for obligation; use 'don't have to' instead.

Wrong: I don't must go.
صحیح: I don't have to go.

Mustn't means it is forbidden, not that it is optional.

Wrong: You mustn't pay if you don't want to.
صحیح: You don't have to pay if you don't want to.

Modals do not take the third-person 's' and are followed by the bare infinitive.

Wrong: He musts to work.
صحیح: He must work.

Next Steps

You have done an amazing job today! Keep practicing these nuances, and you will sound increasingly natural.

Listen to a news report and note the modal verbs used to describe laws.

Continue to: فوت‌وفن‌های Get: همه‌کاره‌ترین فعل انگلیسی

تمرین سریع (10)

Choose the best fit.

___ I ask a question?

✓ Correct! ✗ Not quite. Correct answer: May
May is polite.

frontend.learn_grammar.from_rule: Permission: Can, May, Be Allowed To, Be Supposed To

Choose the correct modal.

Employees ___ use the emergency exit unless there is a fire.

✓ Correct! ✗ Not quite. Correct answer: mustn't
It is a safety rule.

frontend.learn_grammar.from_rule: Prohibition vs. No Necessity: Mustn't vs. Don't Have To

Choose the correct form.

We ___ to smoke here.

✓ Correct! ✗ Not quite. Correct answer: are not allowed
Need 'to be' and past participle.

frontend.learn_grammar.from_rule: Permission: Can, May, Be Allowed To, Be Supposed To

Find the error.

Find and fix the mistake:

You mustn't go if you are tired.

✓ Correct! ✗ Not quite. Correct answer: mustn't
Should be 'don't have to'.

frontend.learn_grammar.from_rule: Prohibition vs. No Necessity: Mustn't vs. Don't Have To

Fill in the blank.

You ___ finish the work today; tomorrow is fine.

✓ Correct! ✗ Not quite. Correct answer: don't have to
It is optional.

frontend.learn_grammar.from_rule: Prohibition vs. No Necessity: Mustn't vs. Don't Have To

Fill in the blank.

___ I borrow your pen?

✓ Correct! ✗ Not quite. Correct answer: Can
Can is for informal permission.

frontend.learn_grammar.from_rule: Permission: Can, May, Be Allowed To, Be Supposed To

Choose the correct modal.

You ___ pay for the entry; it's free.

✓ Correct! ✗ Not quite. Correct answer: don't have to
It is not necessary.

frontend.learn_grammar.from_rule: Prohibition vs. No Necessity: Mustn't vs. Don't Have To

Fill in the blank.

You ___ pay for this, it's free.

✓ Correct! ✗ Not quite. Correct answer: don't need to
It is optional.

frontend.learn_grammar.from_rule: Needn't, Don't Need To, Didn't Need To, Needn't Have: No Obligation

Fill in the blank with the correct form.

You ___ wear a seatbelt by law.

✓ Correct! ✗ Not quite. Correct answer: have to
It is an external rule.

frontend.learn_grammar.from_rule: Obligation and Necessity: Must, Have To, Need To

Choose the correct sentence.

Which sentence is correct?

✓ Correct! ✗ Not quite. Correct answer: I must go.
Must is a modal verb.

frontend.learn_grammar.from_rule: Obligation and Necessity: Must, Have To, Need To

Score: /10

سوالات رایج (6)

No, 'must' has no past form. Use 'had to' instead.
Yes, it is often used in formal writing or by authority figures.
No, 'mustn't' is not used in questions. Use 'do I have to' instead.
Yes, it is often used in official rules and signs.
It's better to use 'may' or 'could'. 'Can' might sound too casual.
Modals like 'can' are followed by the base verb without 'to'.
فصل قبلی
Formal Connectors and Discourse Markers
فصل بعدی
فوت‌وفن‌های Get: همه‌کاره‌ترین فعل انگلیسی
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